Pain after orgasm

I’m about 5 weeks pregnant. The other day me n my partner were getting it on and I climaxed. A couple minutes later he finished too and I started to sweat and feel really hot. Sweat is normal but this time I was dripping and I started to cramp pretty badly to the point where I was dizzy and ready to puke. After about 10 minutes I calmed down and my temp went back to normal. Now I’m afraid to climax again and we haven’t had sex either. Has anyone else had this experience? What can I do in the future to avoid the severe cramping?